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/****************************************************************************
* media.h
*
* This module contains all defines, typedefs, and prototypes for MEDIA.CPP.
*
* from Persistence of Vision(tm) Ray Tracer version 3.6.
* Copyright 1991-2003 Persistence of Vision Team
* Copyright 2003-2004 Persistence of Vision Raytracer Pty. Ltd.
*---------------------------------------------------------------------------
* NOTICE: This source code file is provided so that users may experiment
* with enhancements to POV-Ray and to port the software to platforms other
* than those supported by the POV-Ray developers. There are strict rules
* regarding how you are permitted to use this file. These rules are contained
* in the distribution and derivative versions licenses which should have been
* provided with this file.
*
* These licences may be found online, linked from the end-user license
* agreement that is located at http://www.povray.org/povlegal.html
*---------------------------------------------------------------------------
* This program is based on the popular DKB raytracer version 2.12.
* DKBTrace was originally written by David K. Buck.
* DKBTrace Ver 2.0-2.12 were written by David K. Buck & Aaron A. Collins.
*---------------------------------------------------------------------------
* $File: //depot/povray/3.6-release/source/media.h $
* $Revision: #2 $
* $Change: 2939 $
* $DateTime: 2004/07/04 13:43:26 $
* $Author: root $
* $Log$
*****************************************************************************/
#ifndef MEDIA_H
#define MEDIA_H
#include "point.h"
BEGIN_POV_NAMESPACE
/*****************************************************************************
* Global preprocessor defines
******************************************************************************/
/* Scattering types. */
#define ISOTROPIC_SCATTERING 1
#define MIE_HAZY_SCATTERING 2
#define MIE_MURKY_SCATTERING 3
#define RAYLEIGH_SCATTERING 4
#define HENYEY_GREENSTEIN_SCATTERING 5
#define SCATTERING_TYPES 5
/*****************************************************************************
* Global typedefs
******************************************************************************/
typedef struct Light_List_Struct LIGHT_LIST;
typedef struct Media_Interval_Struct MEDIA_INTERVAL;
typedef struct Lit_Interval_Struct LIT_INTERVAL;
struct Lit_Interval_Struct
{
int lit;
DBL s0, s1, ds;
};
struct Media_Interval_Struct
{
int lit;
int samples;
DBL s0, s1, ds;
COLOUR od;
COLOUR te;
COLOUR te2;
};
struct Light_List_Struct
{
bool active;
DBL s0, s1;
LIGHT_SOURCE *Light;
};
/*****************************************************************************
* Global variables
******************************************************************************/
/*****************************************************************************
* Global functions
******************************************************************************/
void Simulate_Media (IMEDIA **, RAY *, INTERSECTION *, COLOUR , int );
void Backtrace_Simulate_Media(IMEDIA **Media_List, RAY *Ray, INTERSECTION *Inter, COLOUR Colour);
void Initialize_Media_Code();
void Deinitialize_Media_Code();
IMEDIA *Create_Media (void);
IMEDIA *Copy_Media (IMEDIA *);
void Destroy_Media (IMEDIA *);
void Transform_Media (IMEDIA *IMedia, TRANSFORM *Trans);
void Transform_Density (PIGMENT *Density, TRANSFORM *Trans);
void Post_Media (IMEDIA *);
END_POV_NAMESPACE
#endif
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